PCB-based keyboards consist of a cup epoxy PCB, by way of a hard PCB that is backed by a slim polyester layer printed with conductive silver.
These two layers tend to be separated by having a spacer that includes atmosphere ports for the Perfect operation of the switch. These keyboards are available in tactile or types being non-tactile or without embossing. These keyboards are put together through built-in LEDS and can have backlit with Electroluminescent lights or LEDs.